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[Creeperopolis]

Guallatiri is a volcano in Chile with an elevation of 6,060 to 6,071 m (19,882 to 19,918 ft) depending on its ice cap. It is located southwest of the Nevados de Quimsachata volcanic group; some sources classify Guallatiri as a member. Guallatiri is a stratovolcano with numerous fumaroles around the summit. The summit may be a lava dome or volcanic plug, while the lower flanks of the volcano are covered by lava flows and lava domes. The volcano's eruptions have produced mostly dacite along with andesite and rhyolite. Past glaciation has left moraines on Guallatiri.

A large eruption took place approximately 2,600 years ago. Guallatiri has been active in historical times with a number of eruptions, the latest in 1960. Fumarolic and seismic activity is ongoing and has resulted in the deposition of sulfur and other minerals on the volcano. The volcano is covered by an ice cap above 5,500 to 5,800 m (18,000 to 19,000 ft) that has shrunk and fragmented during the course of the 20th and 21st centuries. Guallatiri, along with several other volcanoes, is part of Lauca National Park and is monitored by the Chilean National Geology and Mining Service (SERNAGEOMIN).